Microsoft today announced that some insecure cipher suites currently supported by Microsoft Cloud App Security (MCAS) will be removed later this year. Redmond will no longer provide support for connections using these non-secure cipher suites. Microsoft also announced yesterday that it will end support for the Microsoft Edge Legacy desktop app on March 9, 2021. Microsoft Teams will also drop support for Internet Explorer 11 on November 30, 2020, with the rest of the Microsoft 365 apps and services to remove IE 11 support on August 17, 2021.
Source: https://www.bleepingcomputer.com/news/security/microsoft-is-killing-off-insecure-cloud-app-security-cipher-suites/